India, Feb. 5 -- A shooting incident at an education centre in Sweden's Orebro city on Tuesday left at least 11 people, including the suspected gunman, dead, with Prime Minister Ulf Kristersson describing it as 'worst mass shooting' witnessed by the country in its history.

The attack happened at around 12.30pm local time (11.30am UK time) at Campus Risbergska in the town which is located around 200km (125 miles) west of Stockholm city.

The police believe that the key suspect acted alone.

The motive of the attack is still not known.

Police reportedly carried out investigations at several locations in the town following the attack.

Police has so far ruled out that the incident was connected with terrorism.

Police said officers are wor...